CN102725502A

CN102725502A - Control device and control method for internal combustion engine

Info

Publication number: CN102725502A
Application number: CN2011800072682A
Authority: CN
Inventors: 清水博和
Original assignee: Hitachi Automotive Systems Ltd
Current assignee: Hitachi Astemo Ltd
Priority date: 2010-01-28
Filing date: 2011-01-28
Publication date: 2012-10-10
Anticipated expiration: 2031-01-28
Also published as: JP2011153586A; CN102725502B; US20120303251A1; JP5165705B2; WO2011093462A1; US9133776B2

Abstract

Provided are a control device and a control method for diagnosing whether or not the discrimination between the forward rotation and the reverse rotation of an internal combustion engine is normally performed. Specifically, the rotation signal (POS) outputted for each unit angle of the crankshaft from a crank angle sensor has different pulse widths (WIPOS) for the forward rotation and the reverse rotation of the crankshaft, and the forward rotation and the reverse rotation of the crankshaft are discriminated by measuring the pulse widths (WIPOS). On the basis of the result of the discrimination between the forward rotation and the reverse rotation, a counter value (CNTPOS) which is the counted value of the rotation signal (POS) is updated. At the time of restart, the counter value (CNTPOS) is updated while a counter value (CNTPOSz) at the time of stop is used as the initial value. If the counter value (CNTPOS) at the position of a crank angle set after a start is different from the initial value, it is diagnosed that there is abnormality in the discrimination between the forward rotation and reverse rotation.

Description

The control gear of internal-combustion engine and controlling method

Technical field

The present invention relates to the control gear and the controlling method of internal-combustion engine, at length say, relate to and differentiate rotating and reverse of bent axle, the apparatus and method of the crank shaft angle when the detection internal-combustion engine stops.

Background technique

In the past; The known control gear that such internal-combustion engine is arranged: improve the startability of internal-combustion engine in order after the starting beginning, to begin fuel injection and igniting as early as possible, the crank shaft angle when the storage internal-combustion engine stops is when starting once more; Crank shaft angle during with the stopping of storage is that initial value is estimated crank shaft angle; Begin fuel injection and igniting according to this estimation crank shaft angle, and when stopping, internal-combustion engine is because of stopping after the temporary transient counter-rotating of the pressure in the firing chamber; Thereby detect this and reverse and detect the crank shaft angle (for example, with reference to patent documentation 1) when stopping.

The existing technology document

Patent documentation

Patent documentation 1: TOHKEMY 2006-233914 communique

Summary of the invention

The problem that invention will solve

In addition; As the method that rotates and reverse of differentiating internal-combustion engine; Such method is arranged: the turn-sensitive device (crankshaft angle sensor) that the synchronous pulse signal of output and the rotation of bent axle is set; And make the pulsewidth of said pulse signal or amplitude basis rotate and reverse and difference, compare that differentiation rotates and reverse through instrumentation value and threshold value to pulsewidth and amplitude.

Yet; Owing to turn-sensitive device or the deviation, degeneration etc. of handling the circuit of rotation signal make when just changeing and pulsewidth or amplitude during counter-rotating produces deviation; The discrimination precision that rotates and reverse thus descends, and has the wrong possibility that rotates and reverse of judging internal-combustion engine (bent axle).

And; Produce such problem: owing to wrong judge rotating and reverse and the crank shaft angle of wrong detection when stopping before; Information estimation starting according to this wrong stop position begins crank shaft angle afterwards, and during according to this estimated result control fuel injection and igniting, mistaken cylinder is set the fuel injection and lighted a fire; Produce the abnormal combustion of after-burning, tempering etc., exhaust proterties and startability are worsened.

The present invention accomplishes in view of above-mentioned problem just, the purpose of this invention is to provide a kind of diagnosable control gear that whether has normally carried out the internal-combustion engine that rotates and reverse differentiation of internal-combustion engine (bent axle).

Be used to solve the means of problem

For this reason; The present invention differentiates the rotating and reverse of bent axle of internal-combustion engine; Rotate and reverse the crank shaft angle when differentiating the result and detecting internal-combustion engine and stop according to this; To be the crank shaft angle that goes out of base estimation begin the detected crank shaft angle in back with starting at internal-combustion engine compares to the crank shaft angle when stopping, judging in the said differentiation that rotates and reverse, have no abnormal.

The invention effect

According to foregoing invention, the diagnosable differentiation that rotates and reverse of whether normally having carried out internal-combustion engine (bent axle), can with according to the differentiation of mistake as a result the fuel of controlling combustion engine spray and the anti-possible trouble that terminates in such as igniting.

Description of drawings

Fig. 1 is the system construction drawing of the internal-combustion engine in the mode of execution.

Fig. 2 is the figure that the structure of crankshaft angle sensor and cam sensor in the mode of execution is shown.

Fig. 3 is the sequential chart that the output characteristics of crankshaft angle sensor and cam sensor in the mode of execution is shown.

Fig. 4 be illustrate rotation signal in the mode of execution by rotating and reverse the pulsewidth that causes and the different sequential chart of amplitude.

Fig. 5 is the sequential chart that the increase and decrease of the counter cnt POS in the mode of execution is shown, and (A) is the sequential chart that is illustrated in the variation when correctly detecting counter-rotating, (B) is the sequential chart that is illustrated in the variation when not detecting counter-rotating.

Fig. 6 is illustrated in the mode of execution based on correct fuel when rotating and reverse the starting once more of differentiation to spray and the sequential chart of IGNITION CONTROL.

Fig. 7 is illustrated in the mode of execution rotating and reverse that fuel when differentiating starting once more when wrong sprays and the sequential chart of IGNITION CONTROL.

Fig. 8 illustrates the detection processing of the crank shaft angle in the mode of execution, the discriminating processing that rotates and reverse and the flow chart that rotates and reverse the diagnostic process of differentiation.

Fig. 9 illustrates the detection processing of the crank shaft angle in the mode of execution, the discriminating processing that rotates and reverse and the flow chart that rotates and reverse the diagnostic process of differentiation.

Figure 10 illustrates rotating and reverse in the mode of execution to differentiate that fuel when unusual sprays and the flow chart of IGNITION CONTROL.

Figure 11 is the sequential chart that the diagnostic process that rotates and reverse differentiation in the mode of execution is shown.

Figure 12 illustrates rotating and reverse in the mode of execution to differentiate that fuel when unusual sprays and the flow chart of IGNITION CONTROL.

Embodiment

Below, specify an embodiment of the invention according to accompanying drawing.

Fig. 1 uses the structural drawing of the vehicle of the control gear that the present invention relates to internal-combustion engine 101.In addition, in this mode of execution, internal-combustion engine 101 is 4 cylinders, 4 stroke IC engines in upright arrangement.

In Fig. 1, in the suction tude 102 of internal-combustion engine 101, be fitted with electronic control throttle 103, electronic control throttle 103 utilizes throttle motor 103a that closure 103b is carried out driven for opening and closing.

And internal-combustion engine 101 is drawn into air in the firing chamber 106 of each cylinder via electronic control throttle 103 and intake valve 105.

Suction port 130 at each cylinder is provided with Fuelinjection nozzle 131, and Fuelinjection nozzle 131 is according to carrying out valve opening action, burner oil from the ejection pulse signal as the ECU (control unit of engine) 114 of control gear.

Fuel in the firing chamber 106 is carrying out fire burns through the spark ignition of spark plug 104.In each spark plug 104, ignition module 112 is installed, ignition module 112 is built-in with spark coil and the power transistor of control to the energising of this spark coil.

Combustion gas in the firing chamber 106 flow out to outlet pipe 111 via exhaust valve 107.Being located at the flow through exhaust of outlet pipe 111 of preceding

catalyst

108 and 109 pairs of the catalysts in back in the outlet pipe 111 purifies.

Admission cam shaft 134, exhaust cam shaft 110 have cam integratedly, through this cam intake valve 105 and exhaust valve 107 are moved.

In addition, intake valve 105 and/or exhaust valve 107 can have variable valve actuator for air, and this variable valve actuator for air makes at least one can the change in valve timing, maximum valve lift amount, the valve operating angle.

ECU114 is built-in with microcomputer, carries out computing according to the program that is stored in advance in the storage, control electronic control throttle 103, Fuelinjection nozzle 131, ignition module 112 etc.

The ECU114 input is from the testing signal of various sensors.As various sensors; Be provided with: the accelerator open degree sensor 116 that detects aperture (accelerator open degree) ACC of gas pedal 116a; Detect the airflow sensor 115 of the suction air quantity Q of internal-combustion engine 101; According to the output shaft of internal-combustion engine 101 is the crankshaft angle sensor (turn-sensitive device) 117 that rotation signal (the unit crank shaft angle signal) POS of pulse type is exported in the rotation of bent axle 120; Detect the throttle sensor 118 of the aperture TVO of closure 103b; Detect the cooling-water temperature sensor 119 of temperature T W of the cooling water of internal-combustion engine 101, export the cam sensor 133 of the cam signal PHASE of pulse type, step on the brake switch of connecting under the braking state of brake petal 121 122 the driver of vehicle according to the rotation of admission cam shaft 134; Detection is the vehicle speed sensor 123 of travelling speed (speed of a motor vehicle) VSP of the vehicle of power source with internal-combustion engine 101, or the like.

And the running of ECU114 input internal-combustion engine 101 and the main switch that stops are the signal that switches on and off that switches on and off signal and switch starter 125 of ignition switch 124.

Fig. 2 illustrates the structure of crankshaft angle sensor 117 and cam sensor 133.

Crankshaft angle sensor 117 is made up of signal plate 152 and rotation detecting 153; Signal plate 152 is by 120 supportings of bent axle; Have the jut 151 as detected portion on every side, rotation detecting 153 is fixed on internal-combustion engine 101 sides, detects jut 151 and output rotation signal POS.

Rotation detecting 153 has various processing circuits that comprise Waveform generating circuit, selection circuit etc. and the pick-up that detects jut 151; The rotation signal POS of rotation detecting 153 outputs is the pulse signals that are made up of pulse sequence; This pulse sequence is low level normally, when detecting said jut 151, is changed to high level within a certain period of time.

The jut 151 of signal plate 152 is uniformly-spaced to form with the spacing that crank shaft angle 10 is spent, and the part that makes 2 of jut 151 consecutive miss is arranged on 2 the relative positions of rotating center that clip bent axle 120.

In addition, the disappearance number of jut 151 can be 1, also begins consecutive miss more than 3.

According to said structure; As shown in Figure 3; The rotation signal POS of crankshaft angle sensor 117 (rotation detecting 153) output is changed to for 16 times after the high level so that per 10 degree (unit crank shaft angle) of crank shaft angle are continuous, during 30 degree, keeps low level, is changed to high level continuous once more 16 times.

Therefore; With output crank shaft angle, crank shaft angle 180 degree interval 30 degree is the initial rotation signal POS after (hypodontia zone, disappearance part) between low period; In other words stroke phase difference between the cylinder that this crank shaft angle 180 is spent in 4 cylinder internal-combustion engines 101 that are equivalent to this mode of execution is the igniting interval.

And in this mode of execution, crankshaft angle sensor 117 is configured to, and piston position output crank shaft angle 30 degree of spending (BTDC50 degree) in the budc 50 of each cylinder are the initial rotation signal POS in back between low period (hypodontia zone).

On the other hand; Cam sensor 133 is made up of signal plate 158 and rotation detecting 159; Signal plate 158 is by the end axis supporting of admission cam shaft 134; Have the jut 157 as detected portion on every side, rotation detecting 159 is fixed on internal-combustion engine 101 sides, detects jut 157 and output cam signal PHASE.

Rotation detecting 159 has various processing circuits that comprise waveform shaping circuit etc. and the pick-up that detects jut 157.

The jut 157 of signal plate 158 is provided with 1,3,4,2 respectively at 4 positions of per 90 degree of cam angle, in the part that is provided with a plurality of juts 157 continuously, the spacing of jut 157 is set at crank shaft angle 30 degree (cam angle 15 degree).

And; As shown in Figure 3; The cam signal PHASE of cam sensor 133 (rotation detecting 159) output is the pulse signal that is made up of pulse sequence, and this pulse sequence is low level normally, when detecting said jut 157, is changed to high level within a certain period of time; With per 90 degree of cam angle, per 180 independent 1, continuous 3, continuous 4, continuous 2 of the degree of crank shaft angle are changed to high level.

And; Spend the beginning signal of exporting independent 1 cam signal PHASE and exporting a plurality of cam signal PHASE continuously at interval with crank shaft angle 180; And, between the top dead center TDC of the top dead center TDC of certain cylinder and next cylinder, export independent 1, continuous 3, continuous 4, continuous 2 output pattern respectively.

In more detail; Between the compression top center TDC that sets at the 1st cylinder and the compression top center TDC of the 3rd cylinder; Continuous 3 cam signal PHASE of output between the compression top center TDC of the compression top center TDC of the 3rd cylinder and the 4th cylinder, export 4 cam signal PHASE continuously; Between the compression top center TDC of the compression top center TDC of the 4th cylinder and the 2nd cylinder; Continuous 2 cam signal PHASE of output between the compression top center TDC of the compression top center TDC of the 2nd cylinder and the 1st cylinder, export 1 cam signal PHASE separately.

In addition; Under having through the situation that makes admission cam shaft 134 variable valve actuator for air of the variable air valve correct-timing variable that makes intake valve 105 with respect to the rotatable phase of bent axle 120; Even change valve timing, the outgoing position of cam signal PHASE can crosscut top dead center TDC and change yet.

In other words, the change scope of valve timing is estimated outgoing position and output gap at interior setting cam signal PHASE, even feasible the change valve timing, the quantity of the cam signal PHASE that between each top dead center TDC, exports can not change yet.

The continuous output numerical table of the cam signal PHASE that between each top dead center TDC, exports shows the cylinder numbers that becomes compression top center subsequently; For example; Between this top dead center TDC and the top dead center TDC of last time; Under the situation of 3 cam signal PHASE of output, this top dead center TDC representes it is the compression top center TDC of the 3rd cylinder continuously.

In 4 cylinder internal-combustion engines 101 of this mode of execution; Order according to the 1st cylinder → the 3rd cylinder → the 4th cylinder → the 2nd cylinder is lighted a fire; Thereby as shown in Figure 3, the output pattern of the cam signal PHASE that between top dead center TDC, exports is set according to independent 1, continuous 3, continuous 4, continuous 2 order.

ECU114 for example changes the hypodontia position of waiting judgement rotation signal POS according to the cycle of rotation signal POS, is benchmark with this hypodontia position, the generation number of rotation signal POS is counted, thereby detected top dead center TDC (benchmark crank shaft angle position REF).In this mode of execution, the rotation signal POS of the 6th output behind the hypodontia zone of rotation signal POS is equivalent to the top dead center TDC of each cylinder.

Then; ECU114 counts through the output number to cam signal PHASE between top dead center TDC; Differentiating position of piston subsequently becomes the cylinder of compression top center TDC (predetermined piston position); And the generation number to from the rotation signal POS of top dead center TDC is counted, and detects the crank shaft angle of this moment according to this count value CNTPOS.

When cylinder that detects compression top center TDC and crank shaft angle; Cylinder and fuel injection timing and ignition timing that ECU114 decision carrying out fuel sprays and lights a fire are according to angle (crank shaft angle) output ejection pulse signal and the ignition control signal according to the detected bent axle 120 of said count value CNTPOS.

The differentiation result that position of piston becomes the cylinder of compression top center TDC (predetermined piston position) upgrades according to ignition order; Thereby count through output number between top dead center TDC to cam signal PHASE; Differentiating position of piston subsequently becomes after the cylinder of compression top center TDC (predetermined piston position), can upgrade the cylinder of compression top center TDC according to ignition order at each top dead center TDC.

In addition, the interval that the generation number of cam signal PHASE is counted is not limited between the top dead center TDC, can be with crank shaft angle (piston position) arbitrarily as the benchmark in the interval that the generation number of cam signal PHASE is counted.

And, can be according to the pulsewidth of cam signal PHASE not equal, differentiate the cylinder of predetermined piston position, utilize the generation number of cam signal PHASE to differentiate the cylinder of predetermined piston position with replacement.

And; In this mode of execution, the part disappearance of pulse sequence that can be through making rotation signal POS is the angular orientation (crank shaft angle) of benchmaring bent axle 120 with the disappearance position; Yet the per 10 degree disappearance ground of rotation signal POS are exported; Replace, the benchmark crank shaft angle position that also can be arranged on per 180 degree of crank shaft angle produces the reference position sensor of signal, is benchmark with this reference position signal of sensor; POS counts to rotation signal, detects the angular orientation (crank shaft angle) of bent axle 120 thus.

In addition; Under the situation that internal-combustion engine 101 (bent axle 120) is just changeing; The generation of rotation signal POS is represented bent axle 120 towards positive veer rotation 10 degree, shows the angle of swing from the bent axle 120 of benchmark crank shaft angle position from the generation numerical table of the rotation signal POS of benchmark crank shaft angle position.

Yet; Before internal-combustion engine 101 stops; Sometimes internal-combustion engine 101 (bent axle 120) reverses owing to the compression pressure in the cylinder etc., and the same the continuation counted the generation number of rotation signal POS when just changeing when in this counter-rotating, angular orientation (crank shaft angle) that then can wrong detection bent axle 120.

Therefore; Crankshaft angle sensor 117 (rotation detecting 153) different rotation signal POS (pulse signal) of output pulse width during with counter-rotating when just the changeing of bent axle 120 is so that can differentiate rotate and reverse (with reference to (A) of Fig. 4) of internal-combustion engine 101 (bent axle 120).

As the method that produces pulsewidth different pulse signal according to the sense of rotation of running shaft, use for example TOHKEMY 2001-165951 communique disclosed method.Specifically; Detection pulse signal as the jut 151 of signal plate 152; Produce 2 signals that phase place staggers each other; Judge and rotate and reverse through these signals are compared, select to be generated as any and in 2 pulse signals of different each other pulsewidth WIPOS according to the result of determination that rotates and reverse its output.

In ECU114; Pulsewidth WIPOS to rotation signal POS carries out instrumentation; Is that threshold value SL compares to the instrumentation value WIPOS of pulsewidth with the discrimination threshold that rotates and reverse, and judges the pulsewidth WIPOS when being pulsewidth WIPOS or the counter-rotating when just changeing thus, and differentiating bent axle 120 and being just changes or reverse.

The intermediate value of pulsewidth WIPOS when pulsewidth WIPOS when the threshold value SL that in the differentiation that rotates and reverse, uses is configured to just change and counter-rotating (for example; 55 μ s～80 μ s); In this mode of execution of pulsewidth WIPOS length when the pulsewidth WIPOS ratio when counter-rotating is just changeing, be inverted status if pulsewidth WIPOS more than said threshold value SL, then is judged as; If it is just to change state that pulsewidth WIPOS less than said threshold value SL, then is judged as.

In addition, in this mode of execution, shown in Fig. 4 (A), the pulsewidth WIPOS when just changeing is set at 45 μ s, and the pulsewidth WIPOS during with counter-rotating is set at 90 μ s, yet be not limited to pulsewidth WIPOS is set at 45 above-mentioned μ s, 90 μ s.And the pulsewidth WIPOS in the time of can also being set at the pulsewidth WIPOS ratio counter-rotating when just changeing is big.

And, in the example shown in (A) of Fig. 4, rotation signal POS is set at normally low level; When reaching set angular orientation, be changed to the pulse signal of high level within a certain period of time; Yet also can be high level normally, when reaching set angular orientation, be changed to low level pulse signal within a certain period of time, in this case; Can set between low period by sense of rotation differently, the length between the instrumentation low period is differentiated sense of rotation as pulsewidth WIPOS.

And shown in Fig. 4 (B), the amplitude of rotation signal POS (signal level) can rotate and reverse according to the difference differentiation of amplitude (signal level) by rotating and reverse difference.

In the example shown in (B) of Fig. 4; Rotation signal POS is a low level normally; When reaching set angular orientation, be changed to the pulse signal of high level within a certain period of time, the signal level when setting the angular orientation that reaches set for is high during than counter-rotating when just changeing, specifically; Set the signal of output 5V when just changeing for, the signal of output 2.5V when counter-rotating.

Then, shown in Fig. 5 (A), when bent axle 120 is just changeing; Increase count value CNTPOS during through each generation rotation signal POS, detect the angle of rotation of bent axle 120, when bent axle 120 counter-rotatings towards positive veer; Generation through to rotation signal POS reduces said count value CNTPOS; Bent axle 120 counter-rotatings, correspondingly, towards the angle of rotation minimizing of sense of rotation.

In addition, as shown in Figure 5, to clamp the count value CNTPOS that hypodontia partly makes rotation signal POS and be varied to " 10 " and " 13 " step by step, this is the processing of the generation number of the rotation signal POS when being used to make count value CNTPOS represent not have hypodontia.

And, under the situation of crosscut top dead center TDC, shown in Fig. 5 (A), get back to previous cylinder by ignition order in counter-rotating through the differentiation result who makes the cylinder of being scheduled to piston position, detect the piston position of each cylinder when internal-combustion engine 101 stops.

In the figure shown in (A) of Fig. 5; Order according to the 1st cylinder → the 3rd cylinder → the 4th cylinder → the 3rd cylinder → the 4th cylinder; The cylinder data of new subscription piston position more, yet the such state of this expression: internal-combustion engine 101 counter-rotatings after through the top dead center TDC of the 3rd cylinder, the top dead center TDC of crosscut the 3rd cylinder and returning once more; Between the top dead center of the top dead center TDC of the 1st cylinder and the 3rd cylinder, just switching to from counter-rotating changes, the top dead center TDC of crosscut the 3rd cylinder and stopping.

Counter-rotating before internal-combustion engine 101 stops sometimes as stated, rotates and reverse and detects under the situation of crank shaft angle, even also can detect the piston position of each cylinder of crank shaft angle when stopping when stopping accurately in differentiation.

Then, in the stopping period of internal-combustion engine 101, be to be the stop position of bent axle 120 and the cylinder of predetermined piston position if store differentiation in advance; Then when internal-combustion engine 101 starts once more; Suppose that the crank shaft angle of bent axle 120 when stopping is that initial position is rotated, estimate crank shaft angle in the time of can be from the starting beginning, and; The cylinder of predetermined piston position can be confirmed, fuel injection and igniting can be begun as early as possible and improvement starting responsiveness.

During crank shaft angle when unclear stopping; Beginning not know crank shaft angle during the initial detection reference crank shaft angle position (the disappearance part of rotation signal POS) from starting, and; Can detect the 2nd secondary standard crank shaft angle position and differentiate the cylinder of predetermined piston position; Thereby before detecting the 2nd secondary standard crank shaft angle position, can not determine to carry out the cylinder that fuel sprays and lights a fire, fuel sprays and igniting begins to postpone.

In this mode of execution; ECU114 has such idling and stops to control function: when stop condition is set up automatically under the idle state of internal-combustion engine 101, stop internal-combustion engine 101 automatically; When starting conditions is set up once more after stopping internal-combustion engine 101 automatically, cranking internal combustion engine 101 once more automatically.

Then; Stopping control through idling from halted state is started once more, demanding dynamic response, thereby as stated; Store crank shaft angle and the cylinder of predetermined piston position when stopping in advance; If they are estimated the cylinder of crank shaft angle and predetermined piston position as initial value, began before the cylinder that detects crank shaft angle and predetermined piston position according to rotation signal POS and cam signal PHASE then that fuel sprays and igniting, can obtain high starting responsiveness.

Stop in the control in said idling, for example, speed V SP is 0km/h; Internal-combustion engine rotational speed NE below predetermined rotational speed, accelerator open degree ACC full cut-off, brake switch 122 is connected (braking state); When cooling water temperature TW all sets up with first-class condition at predetermined temperature; Be judged as idling-stopping condition (stop condition automatically) and set up, stop fuel injection and igniting, stop internal-combustion engine 101 automatically.

Said predetermined rotational speed is the value that is used to judge the idle state of internal-combustion engine 101; Be set highlyer slightly than target idling rotational speed; And said predetermined temperature is to be used for allowing self-braking value down at the intact warm state (state behind the warming-up) of internal-combustion engine 101.

On the other hand, under the state that stops internal-combustion engine 101 automatically, for example; Brake switch 122 switches to disconnection (non-braking state); The pedal of perhaps stepping on the throttle, perhaps the endurance of automatic stop condition longer than fiducial time, when perhaps judging cell voltage and descending; Be judged as once more starting conditions and set up, begin once more the fuel of internal-combustion engine 101 is sprayed and igniting.

In addition, stopping control through idling from halted state is started once more, in this mode of execution, use actuating motor to make internal-combustion engine 101 begin rotation.

Fig. 6 illustrates such situation: be stored in crank shaft angle (count value CNTPOS) and the cylinder of predetermined piston position of internal-combustion engine 101 when stopping, when starting once more, spray and igniting according to these storage numerical control fuel.

At example shown in Figure 6, internal-combustion engine 101 stops before the compression top center of the 1st cylinder, and the crank shaft angle position when stopping is the position of preceding 50 degree (BTDC50 degree) of the compression top center of the 1st cylinder.

Data during from above-mentioned stopping are known; In the intake stroke way of the 3rd cylinder; And internal-combustion engine 101 stops in the exhaust stroke way of the 4th cylinder; Thereby ECU114 follows starting beginning, and the 4th cylinder that stops in the 3rd cylinder that in the intake stroke way, stopping and the exhaust stroke way is implemented the fuel injection, and the igniting to the 3rd cylinder and the 4th cylinder is set.

And; When producing rotation signal POS when following the starting beginning; To the value when stopping is that the count value CNTPOS of initial value carries out counts, detects the compression top center of the 1st cylinder according to the result of counts, when detecting the compression top center of the 1st cylinder; With the Data Update of the cylinder that becomes compression top center subsequently is the 3rd cylinder; And at top dead center position count value CNTPOS is reset to 0, make to determine the angle of rotation that to estimate atdc according to count value CNTPOS to begin correct time etc. to the energising of spark coil according to count value CNTPOS.

Dividing from starting beginning back to the toothless portion) that detects rotation signal POS, the value when stopping with the running of last time is that benchmark upgrades count value CNTPOS, estimates the crank shaft angle of this moment thus; When the toothless portion) timesharing that detects rotation signal POS; Be independent of the estimated result of the storage data when stopping, crank shaft angle that confirming as this moment is ATDC130 degree (a BTDC50 degree), afterwards; Through confirming that with this position is that benchmark upgrades count value CNTPOS, detects crank shaft angle.

And; When initial detection toothless portion) assigns to confirm crank shaft angle; Count value according to the rotation signal POS that confirms the position from this; Detect the 2nd time top dead center,, confirm the cylinder before the compression top center according to the quantity of the cam signal PHASE that between the 1st time the top dead center of top dead center and the 2nd time after the starting, exports.

In addition; CYL among Fig. 6 representes the numbering of the cylinder before the compression top center; And CYL1 representes the quantity of cam signal PHASE is counted and detected cylinder, and CYL2 representes that each piston position when stopping is the result that the cylinder of benchmark before as compression top center estimates.

Begin after the cylinder before confirming crank shaft angle and compression top center under the situation of fuel injection and igniting; In example shown in Figure 6; #1 cylinder when confirming cylinder in the exhaust stroke way and the 2nd cylinder that after cylinder is confirmed, becomes intake stroke are to carry out the cylinder that fuel sprays at first; Begin the situation that fuel sprays with the estimated value that according to the crank shaft angle when stopping and each piston position is benchmark and compare, fuel sprays and igniting begins to postpone, and plays dynamic response decline.

In addition; As stated; The rotating and reverse of bent axle 120 judge to be to carry out through the pulsewidth WIPOS of rotation signal POS and threshold value SL compared; Yet the instrumentation value of the pulsewidth WIPOS of rotation signal POS changes according to the circuit deviations of the ECU114 of the output bias of crankshaft angle sensor 117 (rotation detecting 153) and instrumentation pulsewidth WIPOS etc., thus, exists to rotate and reverse the possibility that discrimination precision descends.

And; When reality counter-rotating and mistake is judged to be when just changeing; Crank shaft angle when wrong detection stops and the cylinder of predetermined piston position; When the crank shaft angle after the cylinder of crank shaft angle position when stopping and predetermined piston position is base estimation starting beginning and the cylinder of predetermined piston position, the fuel when starting once more according to this estimated value control sprays and igniting, cause the cylinder of mistake with carry out fuel correct time and spray and light a fire.

Fig. 5 (B) illustrates and can not detect counter-rotating, and in counter-rotating, also being judged as is the variation of the count value CNTPOS when just changeing state and the differentiation result of the cylinder before the compression top center.

Shown in Fig. 5 (B); When being inverted status and false judgment for being when just changeing; Although be inverted status, also make the count value CNTPOS of the angle of rotation of expression atdc change increase, thereby the cylinder before lead to errors detection top dead center position and the false judgment compression top center.

And, as shown in Figure 7 when the false judgment stop position, through being crank shaft angle and the cylinder before the compression top center after base estimation is started once more with the stop position, cause cylinder to mistake to carry out that fuel sprays and igniting, produce the abnormal combustion of tempering etc.

Fig. 7 illustrates such situation: in fact internal-combustion engine 101 stops and can not detecting counter-rotating before the compression top center of the 1st cylinder, thereby wrong detection is that internal-combustion engine 101 stops before the compression top center of the 3rd cylinder.

Before the compression top center of the 3rd cylinder, the 4th cylinder in intake stroke way, and; The 2nd cylinder in exhaust stroke way, thereby in example shown in Figure 7, the storage that stops according to internal-combustion engine 101 before the compression top center of the 3rd cylinder; When starting once more, the 4th cylinder and the 2nd cylinder are carried out the fuel injection; Yet in fact, internal-combustion engine 101 stops before the compression top center of the 1st cylinder, and the 4th cylinder that has carried out the fuel injection is actually exhaust stroke; Cause carrying out igniting the abnormal combustion of generation tempering etc. to the 4th cylinder at intake stroke.

As stated, if store the stop position of internal-combustion engine 101 in advance, according to the crank shaft angle after this storing value estimation starting and the cylinder of predetermined piston position; Spray and igniting according to this estimated result control fuel; Though then can begin fuel injection and igniting as early as possible, improve the starting responsiveness, in the time of can not differentiating the counter-rotating of generation before stopping accurately; The detection of stop position produces error; As a result, cause when starting once more cylinder to mistake to carry out that fuel sprays and igniting, cause exhaust proterties deterioration when starting once more etc.

Therefore, whether the ECU114 diagnosis has normally carried out the differentiation that rotates and reverse based on rotation signal POS, according to the detection of this diagnostic result March shaft angle, sprays and igniting according to detected crank shaft angle control fuel.

Below, specify the detection processing of the crank shaft angle of being undertaken, the situation that rotates and reverse discriminating processing and rotate and reverse the diagnostic process of differentiation according to the flow chart of Fig. 8 and Fig. 9 by ECU114.

Routine shown in the flow chart of Fig. 8 and Fig. 9 is the routine of when crankshaft angle sensor 117 output rotation signal POS, interrupting execution.

At first, in step S501, as exporting from last time the time of rotation signal POS to this rotation signal POS, the generation cycle T POS of instrumentation rotation signal POS, and, this pulsewidth WIPOS of rotation signal POS of instrumentation.

In next step S502, judge whether counting beginning label FCNT is set with initial value " 0 ".

FCNT is set with under the situation of " 0 " at the counting beginning label, enters step S503, and whether the rotation signal POS that differentiates this is the starting beginning initial rotation signal POS in back.

Under the situation that is initial rotation signal POS, enter step S504, judge whether to store the value of count value counter cnt POSz of the rotation signal POS of the expression crank shaft angle when last time, internal-combustion engine 101 stopped.

Under the situation of the value of the counter cnt POSz of storage when stopping not, do not know at this rotation signal POS of which angular orientation output of bent axle 120, thereby enter step S513, be judged to be and do not know crank shaft angle.

Do not know crank shaft angle during, be not sure of that fuel sprays and the correct time of igniting, thereby do not begin that fuel sprays and igniting but wait for.

On the other hand; Under the situation of the value of the counter cnt POSz when storing that last time, internal-combustion engine 101 stopped; The position that is estimated as when this stops to begin starting, enters step S505, and the value of the counter cnt POSz when stopping that will turning round last time is set at the initial value of counter cnt POS.

Then; Through counter cnt POS is carried out initial setting; Refresh counter CNTPOS when at every turn producing rotation signal POS can detect the crank shaft angle of this moment according to the value of counter cnt POS, thereby enter step S506; Be set at 1 through counting beginning label FCNT, permit refresh counter CNTPOS.

And, in next step S507, judge whether the value of the counter cnt POS when last time, running stopped is " 10 ".

CNTPOS=10 is the value of expression with the rotation signal POS of BTDC80 degree output, and the BTDC80 degree is the outgoing position of the rotation signal POS before toothless portion) divides.

Therefore; The value of counter cnt POSz when stopping is under the situation of " 10 "; Internal-combustion engine 101 stops in rotation signal POS becomes the angular regions of hypodontia, the rotation signal POS after the rotation signal POS of this that can be estimated as that internal-combustion engine 101 is just being changed the line of production living in the starting once more of actuating motor is the hypodontia zone.

Therefore, the value of the counter cnt POSz when last time, running stopped is under the situation of " 10 ", enters step S508, counter cnt POS is set " 13 " of expression hypodontia zone rotation signal POS afterwards.

Under the situation that counter cnt POS=13 exports rotation signal POS not being carried out hypodontia, expression is equivalent to the 13rd rotation signal POS behind the top dead center TDC, and in other words, expression is the crank shaft angle position of ATDC130 degree.

On the other hand, the value of the counter cnt POSz when last time running stops is not under the situation of " 10 ", enters step S516, and the counter cnt POS that makes the value of the counter cnt POSz when last time, running stopped be set at initial value increases 1.

In addition, when the last sub-value CNTPOSz among the step S516 produces rotation signal POS first after the starting beginning, be the value of the counter cnt POSz when last time, running stopped, after the 2nd time, be the value of upgrading last time.

Then, in next step S517, judge whether the value of the counter cnt POS that in step S516, increases is " 18 ", under the situation that is not CNTPOS=18, directly finish this routine.

On the other hand, under the situation of CNTPOS=18, enter step S518, the value of counter cnt POS is reset to 0, and, in next step S519, output reference crank shaft angle signal REF.

Counter cnt POS=0 is equivalent to the top dead center tdc position of each cylinder, during output reference crank shaft angle signal REF, that is, during top dead center TDC, the generation number of cam signal PHASE is counted, and differentiates the cylinder of compression top center.

As stated, counter cnt POS is reset to 0 at the top dead center TDC of each cylinder, it is the value of unit representation angle of rotation towards positive veer from top dead center TDC that counter cnt POS is made as with 10 degree.

Under the situation to counting beginning label FCNT setting 1 in step S506, when produce rotation signal POS next time, enter step S514 from step S502; Under the situation of the value of not storing the last time running counter cnt POSz when stopping; Counting beginning label FCNT remains 0, thereby when produce rotation signal POS next time, enters step S503 from step S502; Not first through in step S503, being judged as, enter step S509.

In addition, the processing of the value of the counter cnt POSz when stopping that turning round is stored in execution, can be defined in through idling to stop to control the situation that stops internal-combustion engine 101 automatically.This is because stopping control through idling from halted state is started automatically once more, height when requirement starting response ratio is started through driver's key operation operation; And; Under the situation of starting through driver's key operation operation, crank shaft angle might be in the middle variation that stops of internal-combustion engine, and the crank shaft angle position when stopping is different with the crank shaft angle position of starting before beginning; If the crank shaft angle when stopping to be estimated the crank shaft angle after the starting beginning, then might carry out mistake estimation.

In step S509, compare through last sub-value and this sub-value the generation cycle T POS of rotation signal POS, whether the rotation signal POS that judges this is equivalent to the initial rotation signal POS behind the hypodontia zone.

Producing cycle T POS sharply increases at the hypodontia position of exporting rotation signal POS with the interval of crank shaft angle 30 degree; Thereby under the situation about changing in the big cycle that the variation that surpasses the cycle T POS that the change by rotational speed causes is arranged, the cycle T PSO that can be judged as this is the result after instrumentation becomes 30 degree part (hypodontia part) at interval.

Then; Under the situation of initial rotation signal POS after this rotation signal POS is equivalent to the hypodontia zone; Detect the position of budc 50 degree (BTDC50 degree) according to rotation signal POS; In this case, enter step S510, counter cnt POS is set and corresponding " 13 " of ATDC130 degree (BTDC50 degree).

In next step S511, FCNT sets 1 to the counting beginning label, and, in step S512, crank shaft angle is confirmed that flag F DEC sets 1.

The value of counter cnt POSz when said crank shaft angle confirms that flag F DEC stops according to last time running sets 1 to counting beginning label FCNT; Under the situation of beginning refresh counter CNTPOS; Keep initial value 0, on the other hand, the counter cnt POSz when not storing that last time, running stopped; Begin to be set at 1 under the situation of refresh counter CNTPOS after the initial rotation signal POS behind the detection hypodontia zone.

The rotation signal POS that in step S509, is judged as this is not equivalent to enter step S513 under the situation of the initial rotation signal POS behind the hypodontia zone, is judged as and does not know crank shaft angle.

Promptly; Under the situation of not storing the last time running counter cnt POSz when stopping, before the initial rotation signal POS after detecting the hypodontia zone, the testing result of crank shaft angle is not known in output; During initial rotation signal POS after detecting the hypodontia zone; At this time point, can confirm as crank shaft angle is ATDC130 degree (BTDC50 degree), thereby since refresh counter CNTPOS next time.

Therefore; Under the situation of not storing the last time running counter cnt POSz when stopping; Do not know crank shaft angle before the initial rotation signal POS after detecting the hypodontia zone, after the initial rotation signal POS after detecting the hypodontia zone, can begin fuel injection and igniting.

On the other hand; Under the situation that stores the last time running counter cnt POSz when stopping; This storing value is set at the initial value of counter cnt POS; Begin refresh counter CNTPOS immediately, the counter cnt POSz when stopping turning round last time thus is the crank shaft angle after the base estimation starting beginning, thereby can begin fuel injection and igniting as early as possible.

When counting beginning label FCNT is set 1, enter step S514 from step S502, in step S514, judged whether to produce the halt instruction of internal-combustion engine 101, specifically, whether stop fuel injection and igniting.

Here, under the situation of the processing of the counter cnt POSz when being defined in stopping automatically of stopping to control through idling and carrying out the storage running and stop, can said halt instruction be defined in through what idling stopped to control and stop automatically.

If do not produce halt instruction, but in the running of the internal-combustion engine 101 that continues fuel injection and igniting, then enter step S515.

In step S515, S509 is the same with step, compares through last sub-value and this sub-value to the generation cycle T POS of rotation signal POS, and whether the rotation signal POS that judges this is equivalent to the initial rotation signal POS behind the hypodontia zone.

Under the situation of initial rotation signal POS after this rotation signal POS is not the hypodontia zone, enter step S516, make the counter cnt POS of last time increase 1 and become this value.

And, in step S515, when the rotation signal POS that is judged as this is the initial rotation signal POS behind the hypodontia zone, enter step S520.

In step S520, judge whether crank shaft angle to be confirmed that flag F DEC sets 1.

Under the situation of crank shaft angle being confirmed flag F DEC setting 0, that is, store the counter cnt POSz when internal-combustion engine 101 is stopped, and after the starting beginning, make under the situation of counter cnt POS counts according to this storing value, enter step S521.

In step S521, differentiate counter cnt POSz with last time, the counter cnt POSz when promptly last time, running stopped is whether the value that initial value carries out after the counts is near " 10 ".

Under the situation of normal counts counter cnt POS; When exporting rotation signal POS before in the hypodontia zone; Because counts is to counter cnt POS=10, thereby the counter cnt POS of the counts of the time point of the initial rotation signal POS behind the output hypodontia zone before handling is normal for the state of " 10 ".

But; Under the situation of the counter-rotating that can not correct decision produces during the stopping of internal-combustion engine 101; The value of counter cnt POS does not correspond to the crank shaft angle of the reality when stopping; If the counter cnt POSz when stopping with this is initial value begins counter cnt POS when starting once more a counts, then will wrong detection crank shaft angle during starting.

Here; The hypodontia of rotation signal POS is to produce with certain crank shaft angle; And bent axle 120 can not reverse under based on the crankshaft rotating state of actuating motor; But continue just to change from stop position, thereby after the starting of internal-combustion engine 101 begins, begin to detect the time point of the hypodontia of rotation signal POS, confirm crank shaft angle.

Therefore; Value at the counter cnt POS of the time point of the hypodontia that detects rotation signal POS; In other words; Position when stopping with running be benchmark the estimation crank shaft angle not with the situation of hypodontia position corresponding " 10 " under, the result that the counter-rotating before mistake stops to be judged is the crank shaft angle of wrong detection when going out to stop, thereby the crank shaft angle that can be judged as when stopping is the crank shaft angle and actual crank shaft angle generation deviation that benchmark estimates.

But, in handling, even correct decision rotates and reverse, sometimes also owing to make a little error of detection generation of crank shaft angle counter-rotating correct time of sense of rotation etc. based on the increase and decrease of the counter cnt POS that rotates and reverse judgement.

Therefore, in step S521, whether the absolute value of difference of counter cnt POSz and expected value 10 of judging last time is below admissible value ESL (for example 1～3).

Even said admissible value ESL sets according to the angle that under the state that can correctly rotate and reverse differentiation, also produces as the stop position error of internal-combustion engine 101; Suitably storage in advance; Make that the counter cnt POSz of last time and the difference of expected value surpass said admissible value ESL when rotating and reverse differentiation generation mistake.

Then; Absolute value in the difference of the counter cnt POSz of last time and expected value 10 surpasses under the situation of said admissible value ESL; Can not judge correctly that internal-combustion engine 101 stops counter-rotating before; Thereby the crank shaft angle of wrong detection internal-combustion engine 101 when stopping; The stop position that this is wrong as initial value at starting beginning back counts counter cnt POS once more and detect crank shaft angle, thereby the toothless portion) timesharing that goes out rotation signal POS when primary detection after starting, the value that the value that is estimated as counter cnt POS is not and hypodontia is partly corresponding.

Therefore, surpass under the situation of said admissible value ESL at the absolute value of the difference of the counter cnt POSz of last time and expected value 10, be judged to be based on rotating and reverse of the bent axle 120 of the pulsewidth WIPOS of rotation signal POS differentiate produce unusual; In other words; Be can not the correct decision inverted status state, enter step S522, the driver of warning vehicle produces said unusual; Supervise as early as possible and repair, and execution is used to tackle control on Abnormal (fault treatment).

Said unusual diagnostic result can remain to the absolute value of difference of the counter cnt POSz that in step S521, is judged as last time and expected value 10 below admissible value, perhaps can follow in the repairing of engineering repair works and adjustment operation and mandatory replacement.

To said driver's warning, for example can use near the bright lamp of the emergency warning lamp 171 that waits the driver's seat that is located at vehicle to carry out, perhaps also can wait to the driver and inform that generation is unusual through sound guidance.

And, as said fault treatment, can be the estimated result of the crank shaft angle of initial value according to the crank shaft angle when stopping, the decision of prohibition of fuel injection and ignition timing forbids that perhaps idling stops control, details will be explained below.

On the other hand; The absolute value of difference of counter cnt POSz and expected value 10 that in step S521, is judged as last time is under the situation below the admissible value ESL; Be judged as that to rotate and reverse discrimination function normal; Can correctly judge the counter-rotating before that stops of internal-combustion engine 101, walk around step S522, enter step S523.

In step S523,, crank shaft angle is confirmed that flag F DEC sets 1 according to the regional detection of this hypodontia.

And, in step S524, to counter cnt POS set with the hypodontia zone after the corresponding value " 13 " of initial rotation signal POS.

And; In step S520, be judged as crank shaft angle is confirmed that flag F DEC sets under the situation of " 1 ",, had detected the hypodontia zone that is in the past in last time; The detection in this hypodontia zone is after the 2nd time after starting once more; Being under the situation of benchmaring crank shaft angle with the hypodontia zone of rotation signal POS after the starting, walk around step S521～step S523 and enter step S524, counter cnt POS is set " 13 ".

And, when in step S514, judging the halt instruction (producing the halt instruction that stops to control through idling) that produces internal-combustion engine 101, enter step S525.

In step S525, pulsewidth WIPOS and the threshold value SL of rotation signal POS compared, if pulsewidth WIPOS more than threshold value SL, then is judged to be bent axle 120 counter-rotatings,, just changeing pulsewidth WIPOS if, then being judged to be bent axle 120 less than threshold value SL.

Then, when bent axle 120 is just changeing, enter step S515, carry out such processing repeatedly: counts counter cnt POS when at every turn producing rotation signal POS resets to when counter cnt POS reaches " 18 " " 0 ".

On the other hand, when determining bent axle 12 counter-rotatings, enter step S526, judge whether the last sub-value CNTPOSz of counter cnt POS is 0.

Then, not under 0 the situation, to enter step S527 at last sub-value CNTPOSz, make the value of counter cnt POS reduce 1 than last sub-value CNTPOSz, tackle returning of the crank shaft angle that causes by counter-rotating thus, directly finish this routine afterwards.

But, when getting into step S527, be under the situation of " 13 " at last sub-value CNTPOSz, the rotation signal POS that is judged as this is the rotation signal POS before the hypodontia zone, in step S527, counter cnt POS is set at " 10 ".

And, not " 0 " if go up sub-value CNTPOSz, then enter step S528, the value of counter cnt POS is reset to when just changeing counter cnt POS is reset to the value " 17 " before 0.

That is, when bent axle 120 was just changeing, counter cnt POS was changed to ... 17 → 0 → 1 → 2 ... → 17 → 0 → ..., thereby, make counter cnt POS be changed to " 17 " from " 0 " set by step in when counter-rotating, when producing rotation signal POS from " 17 " countdown.

In step S529, output reference crank shaft angle signal REF.

Shown in above-mentioned steps S514, step S525～step S529, the step S515～step S524, when producing halt instruction, judge and rotate and reverse and the processing of refresh counter CNTPOS is equivalent to detect the processing of stop position; Stop to control through idling stop internal-combustion engine 101 during; Continuation is to the ECU114 energized, and the storage of the crank shaft angle when the counter cnt POS after ECU114 will upgrade before stopping to stop as expression keeps.

In addition, the value of the counter cnt POS in the time of can internal-combustion engine 101 being stopped is stored in the nonvolatile memory.

Below, in the differentiation that rotates and reverse the fault treatment when unusual, the concrete contents processing among the promptly said step S522 take place according to the flowchart text of Figure 10.

The flow chart of Figure 10 illustrates ECU114 (for example 10ms) routine of interrupt carrying out at regular intervals, at first, in step S701, judges that crank shaft angle confirms whether flag F DEC is 1.

Crank shaft angle confirms that flag F DEC is that 1 situation is such state: the hypodontia zone of after starting, detecting rotation signal POS; Counting (counter cnt POS) through the rotation signal POS that is benchmark with this hypodontia zone can be confirmed crank shaft angle; Thereby enter step S704; According to the correct time that counter cnt POS decision fuel sprays and lights a fire, implement fuel injection and igniting.

On the other hand, confirm that in crank shaft angle flag F DEC is 0, begin also not detect the hypodontia zone, be not sure of under the situation of crank shaft angle, enter step S702 from starting.

In step S702, judge whether it is to stop control automatically once more during cranking internal combustion engine 101 through idling.

When being the key operated cranking internal combustion engine 101 through the driver under the situation of (when starting) through manually-operable; With stop control through idling and compare during cranking internal combustion engine 101 once more automatically; Requiring of starting responsiveness is low; Even begin to wait the hypodontia zone of by the time detecting rotation signal POS just to begin fuel injection and igniting from crankshaft rotating, also can obtain to start fully responsiveness.

Therefore, not to stop control automatically once more during cranking internal combustion engine 101, but under the situation during the key operated cranking internal combustion engine 101 through the driver, entering step S705, determining the correct time of prohibition of fuel injection and igniting through idling.

That is, under the situation when being the key operated cranking internal combustion engine 101 through the driver, after starting, detect the hypodontia zone of rotation signal POS; Counting (counter cnt POS) through the rotation signal POS that is benchmark with this hypodontia zone can be confirmed crank shaft angle; In other words, crank shaft angle confirms that flag F DEC becomes 1, then in step S704; According to the correct time that counter cnt POS decision fuel sprays and lights a fire, implement fuel injection and igniting.

On the other hand, in step S702, being judged as is under the situation when stopping to control automatically once more cranking internal combustion engine 101 through idling, enters step S703.

In step S703, judge that differentiating based on rotating and reverse of the bent axle 120 of the pulsewidth WIPOS of rotation signal POS is normally or unusual.

Then; Under the situation about rotating and reverse that can normally differentiate bent axle 120, can be according to rotating and reverse the crank shaft angle of differentiation when detecting internal-combustion engine 101 accurately and stopping, and; As long as can detect crank shaft angle accurately, just can correctly detect the cylinder of the predetermined piston position when stopping.Therefore, from starting beginning back to the hypodontia zone of detecting rotation signal POS, can the position information when stopping to estimate the cylinder of crank shaft angle and predetermined piston position accurately, can begin as early as possible that fuel sprays and igniting, improve the starting responsiveness.

Therefore; In step S703, be judged as under the situation about rotating and reverse that normally to differentiate bent axle 120; Enter step S704; Thus, be that initial value estimates that the cylinder of the result of the crank shaft angle after the starting beginning and the predetermined piston position when stopping be that benchmark is estimated as is the cylinder of predetermined piston position after the starting beginning according to the crank shaft angle when stopping, carrying out that fuel sprays and igniting before the detection in hypodontia zone.

On the other hand; The differentiation that rotates and reverse at bent axle 120 has unusual; Exist under the situation of the possibility that false judgment rotates and reverse; The testing precision of the crank shaft angle when internal-combustion engine 101 stops and the cylinder of predetermined piston position descends, and when the cylinder of crank shaft angle when stopping and predetermined piston position is the cylinder of crank shaft angle and predetermined piston position after initial value is estimated the starting beginning, leads to errors and judges the cylinder of crank shaft angle and predetermined piston position.

Then; When the cylinder control fuel according to the crank shaft angle of mistake and predetermined piston position sprays and during igniting; Cause carrying out fuel injection and igniting, produce abnormal combustion (after-burning and tempering etc.), exhaust proterties and startability are worsened in correct time different and wrong cylinder with the correct time of expection.

Therefore, differentiating rotating and reverse of bent axle 120 has under the unusual situation, enters step S705, prohibition of fuel injection and IGNITION CONTROL.Therefore, have under the unusual situation rotating and reverse to differentiate, even stop control automatically once more during cranking internal combustion engine 101 through idling; The same during also with key operated cranking internal combustion engine 101 through the driver; After starting, detect the hypodontia zone of rotation signal POS, confirm that in definite crank shaft angle and with crank shaft angle flag F DEC was set at before 1, did not enter step S704; Confirm crank shaft angle; And,, implement fuel injection and igniting afterwards through being the cylinder of the definite predetermined piston position of counting (counter cnt POS) of the rotation signal POS of benchmark with the hypodontia zone.

Thus, though the fuel when stopping to control automatically once more cranking internal combustion engine 101 through idling sprays and igniting begins to postpone, the starting responsiveness descends, and can suppress because at the cylinder of mistake with carry out the fuel injection correct time and light a fire producing abnormal combustion.

In addition, in step S703, be judged as to rotate and reverse and judge to have unusual and enter under the situation of step S705, terminate in be judged as unusual before the fuel in determined correct time spray and igniting.

Figure 11 is the same with example shown in Figure 7; Illustrate in fact that internal-combustion engine 101 stops but can not differentiating counter-rotating before the compression top center of the 1st cylinder; Thereby wrong detection is under the situation that internal-combustion engine 101 stops before the compression top center of the 3rd cylinder, unusual correct time that the diagnosis counter-rotating is differentiated and based on the situation of the abort process of the igniting of this diagnosis.

In example shown in Figure 11; The storage that stops according to internal-combustion engine 101 before the compression top center of the 3rd cylinder; When starting once more, the 4th cylinder and the 2nd cylinder are carried out the fuel injection; And the value " 6 " of the counter cnt POS when stopping is an initial value, after starting, makes counter cnt POS counts.

Here; In the value of the counter cnt POS of the time point of the hypodontia part that detects rotation signal POS is not original " 10 " but " 5 "; Thereby can not judge the counter-rotating before stopping accurately; Therefore be judged as in the value that the stops hour counter CNTPOS actual crank shaft angle of correct representation not, judge the unusual of counter-rotating discrimination function.

Then and since determine unusual time point be according to the stop position of mistake judge be provided with to before the ignition timing of the 4th cylinder, thereby end igniting to the 4th cylinder according to abnormality juding, avoid occurring in the tempering that intake stroke is caused by igniting.

The unusual time point that determines said counter-rotating discrimination function is the correct time of confirming crank shaft angle simultaneously; Thereby can control accurately after this that fuel sprays and igniting, when the starting beginning in the igniting in the correct time before the compression top center of fuel at each cylinder of the 4th cylinder and the 2nd cylinder injection fire burns.

As rotating and reverse the countermeasure that judge to produce when unusual; Can adopt following structure: as stated; Stopping control through idling when starting once more; Forbid based on the crank shaft angle when stopping being that the fuel of estimated result of the crank shaft angle of initial value sprays and IGNITION CONTROL, forbid that in addition idling stops control.

The flow chart of Figure 12 is illustrated in to rotate and reverse judges the processing that the ECU114 that idling stops to control takes place to forbid under the unusual situation.

The flow chart of Figure 12 illustrates ECU114 (for example 10ms) routine of interrupt carrying out at regular intervals, at first, in step S801, judges that crank shaft angle confirms whether flag F DEC is 1.

Then, confirm that in crank shaft angle flag F DEC is under 1 the situation, enter step S802, judge whether stop to control the condition that stops internal-combustion engine 101 automatically through idling sets up.

Here,, enter step S803, judge that differentiating based on rotating and reverse of the bent axle 120 of the pulsewidth WIPOS of rotation signal POS is normally or unusual stopping to control through idling under the situation that the condition that stops internal-combustion engine 101 automatically sets up.

Can normally rotating and reverse under the situation of judgement, enter step S806, fuel sprays and igniting through stopping, and the running of internal-combustion engine 101 is stopped automatically.

Here, when 101 counter-rotatings of internal-combustion engine before stopping, the counter-rotating of bent axle 120 can be detected accurately, crank shaft angle and the cylinder of predetermined piston position when stopping can be roughly correctly detected according to the pulsewidth WIPOS of rotation signal POS.Therefore; Make internal-combustion engine 101 automatically once more under the situation of starting, the crank shaft angle when stopping is that initial value is estimated crank shaft angle, and being that the cylinder of predetermined piston position is the cylinder that benchmark is estimated predetermined piston position when stopping; Thus before the hypodontia zone of rotation signal POS is detected in starting beginning back; The crank shaft angle that can roughly judge rightly this moment and the cylinder of predetermined piston position can determine fuel to spray and ignition timing accurately, begin fuel injection and igniting as early as possible.

In other words, can roughly correctly detect the crank shaft angle when stopping, can beginning as early as possible when starting once more in view of the above that fuel sprays and igniting, thereby permit stopping control and stop internal-combustion engine 101 automatically through idling.

On the other hand,, can not differentiate accurately under the situation about rotating and reverse rotating and reverse the differentiation generation unusually, when internal-combustion engine 101 reverses before stopping, the testing result generation error of the crank shaft angle when stopping.

Therefore; Take place under the unusual situation in the differentiation that rotates and reverse; When according to the crank shaft angle when stopping being crank shaft angle decision fuel that initial value estimates when spraying with ignition timing, though fuel sprays and the igniting beginning early, the possibility of existence generation abnormal combustion; And; When making fuel spray with ignition lag before the hypodontia zone of primary detection rotation signal POS when starting once more, though can suppress the generation of abnormal combustion, fuel sprays and the beginning to postpone of igniting and make the deterioration of starting responsiveness.

Therefore; Take place under the unusual situation in the differentiation that rotates and reverse, stop the establishment of internal-combustion engine 101 conditions automatically, also enter step S805 even stop control through idling; Continue to implement fuel injection and igniting, do not stop internal-combustion engine 101 automatically and the running of continuation internal-combustion engine 101.

In step S802, be judged as through idling and stop to control under the invalid situation of the condition that stops internal-combustion engine 101 automatically, that is, under the situation of internal-combustion engine 101 that requires to remain in operation, enter step S805, continue to implement that fuel sprays and igniting.

And; In step S801, be judged as crank shaft angle and confirm that flag F DEC is under 0 the situation; In other words; Being under the situation during from when beginning starting to the hypodontia zone of detecting rotation signal POS, enter step S804, judge whether it is to stop to control when the automatic stop condition of internal-combustion engine 101 starts once more through idling.

Then, if stop control when starting once more through idling, then enter step S805, the fuel that carries out cylinder based on crank shaft angle when stopping and predetermined piston position and be the cylinder of crank shaft angle that initial value estimates and predetermined piston position sprays and igniting.

Owing to can detect counter-rotating accurately; The following idling of implementing of state that can detect stop position thus accurately stops control; Thereby under the situation that stops to control starting once more through idling; Can be that the crank shaft angle afterwards and the cylinder of predetermined piston position are estimated to start in reference, high-accuracy ground with the stop position; Thus, can control accurately that fuel sprays and igniting, thereby can carry out that fuel sprays and igniting from the time point before the hypodontia zone of detecting rotation signal POS and the cylinder of confirming crank shaft angle and predetermined piston position.

On the other hand, not to stop when starting control through idling, but under the situation during the key operated starting through the driver; Even detect the hypodontia part of rotation signal POS, confirm that the cylinder of crank shaft angle and predetermined piston position begins fuel injection and igniting afterwards, also can obtain the starting responsiveness that fully needs; Thereby enter step S806 from step S804; The cylinder of crank shaft angle and predetermined piston position is confirmed in prohibition of fuel injection and igniting, begins afterwards that fuel sprays and igniting.

Preferably, taking place owing to the differentiation that rotates and reverse to forbid unusually under the situation that idling stops to control that the alerting drivers such as bright lamp through emergency warning lamp are the illegal states that idling stops to control.

In addition, in the above-described embodiment, differentiate unusual time point beginning to judge to rotate and reverse; Carry out the alerts action of bright lamp etc. immediately through emergency warning lamp; And, carry out and to be used to tackle unusual fault treatment, yet judge under the unusual situation continuing to diagnose out to rotate and reverse; Can confirm fault verification, carry out the bright lamp of emergency warning lamp etc.

And; Under the condition of just changeing at internal-combustion engine 101 (bent axle 120) (for example, in the crankshaft rotating, the state that rises of the speed of a motor vehicle, internal-combustion engine rotational speed), detect the pulsewidth of rotation signal POS; Diagnosablely thus differentiate unusual by rotating and reverse of causing unusually of pulsewidth; In this case, can forbid that also crank shaft angle when stopping with internal-combustion engine is that the fuel of the crank shaft angle obtained of initial value sprays and the control of igniting, forbids that perhaps idling stops control.

Label declaration

101: internal-combustion engine; 104: spark plug; 114:ECU (control unit of engine); 117: crankshaft angle sensor; 120: bent axle; 131: Fuelinjection nozzle; 133: cam sensor; 134: camshaft.

Claims

1. the control gear of an internal-combustion engine, wherein, the control gear of said internal-combustion engine has:

Just changeing the counter-rotating judgement unit, it differentiates the rotating and reverse of bent axle of internal-combustion engine;

The stop position detection unit, it is according to the said differentiation that rotates and reverse of just changeing the counter-rotating judgement unit, the crank shaft angle when detecting said internal-combustion engine and stopping; And

Diagnosis unit; Its to go out with said stop position detection stop the time crank shaft angle be the crank shaft angle that goes out of base estimation, begin the detected crank shaft angle in back with starting and compare at said internal-combustion engine, judges that the said judgement unit that reverses that just changeing has no abnormal.

2. the control gear of internal-combustion engine according to claim 1, wherein,

Said just changeing the counter-rotating judgement unit according to according to the output of the per unit angle of said bent axle, when said bent axle rotates and reverse different rotation signal, differentiate rotating and reverse of said bent axle,

Said stop position detection unit detects the crank shaft angle when stopping through according to the differentiation that rotates and reverse said rotation signal being counted.

3. the control gear of internal-combustion engine according to claim 2, wherein,

Said diagnosis unit is when said engine starting; With said stop position detection go out stop the time crank shaft angle be that benchmark is counted said rotation signal and estimated crank shaft angle; The estimated value of said crank shaft angle when detecting the benchmark crank shaft angle after beginning according to the starting at said internal-combustion engine judges that the said counter-rotating judgement unit that just changeing has no abnormal.

4. the control gear of internal-combustion engine according to claim 1, wherein,

The control gear of said internal-combustion engine also has:

The idling stop control unit, it stops said internal-combustion engine automatically when predefined stop condition is set up, when predefined starting conditions is once more set up, start said internal-combustion engine automatically once more;

Startup control unit, it starts under the situation of said internal-combustion engine at said idling stop control unit once more, according to go out with said stop position detection stop the time crank shaft angle be that the crank shaft angle that base estimation goes out is controlled said internal-combustion engine; And

The unit is forbidden in control; It determines at said diagnosis unit just changes under the unusual situation of counter-rotating judgement unit, forbids that the estimated value of control or said startup control unit that said idling stop control unit the stops said internal-combustion engine automatically crank shaft angle when stopping to control the action of said internal-combustion engine.

5. the control gear of internal-combustion engine according to claim 3, wherein, said diagnosis unit is judged to be that said just to change the counter-rotating judgement unit unusual under the situation of difference greater than admissible value of the estimated value of said crank shaft angle and said benchmark crank shaft angle.

6. the control gear of internal-combustion engine according to claim 2, wherein,

Said rotation signal is the pulse signal that the pulse sequence by the per unit angle of said bent axle constitutes, and, the difference when pulsewidth of said pulse signal rotates and reverse at said bent axle,

The said counter-rotating judgement unit that just changeing compares the instrumentation value and the threshold value of the pulsewidth of said rotation signal, differentiates rotating and reverse of said bent axle.

7. the control gear of internal-combustion engine according to claim 1, wherein, the control gear of said internal-combustion engine also has the warning unit, and said warning unit determines said just the commentaries on classics under the unusual situation of counter-rotating judgement unit at said diagnosis unit, and warning takes place unusual.

8. the control gear of internal-combustion engine according to claim 3, wherein,

Said rotation signal is preestablished at place, predetermined crank angle partly disappearance,

Said diagnosis unit is benchmaring benchmark crank shaft angle according to the disappearance part of the said rotation signal of generation cycle detection of said rotation signal with the disappearance part.

9. the controlling method of an internal-combustion engine, in the controlling method of said internal-combustion engine,

Rotating and reverse of the bent axle of differentiation internal-combustion engine,

According to the said differentiation that rotates and reverse, the crank shaft angle when detecting said internal-combustion engine and stopping,

To be the crank shaft angle that goes out of base estimation begin the detected crank shaft angle in back with starting at said internal-combustion engine to crank shaft angle to said detected stopping the time compares, judge in the said differentiation that rotates and reverse, have no abnormal.